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  1. Alexey881

    Simple Statics Problem?

    Cause the system is indeterminate, in fact depending on the situation you may have prying on both toes of the angle, or on edge 1 and toe, or edge 2 and toe but on perpendicular axis. In fact, in the end I did not go with the assumption to which you're responding. I'm just exploring...
  2. Alexey881

    Simple Statics Problem?

    Yes, if we only had Tension at horizontal bolt then I agree 2Q=Tension on vertical bolt. However we have both T and V at horizontal bolt. (just resolve the moment on bolt line as M=F/(h-b)) (there is an assumption that angles are rigid and hence shear is transferred equally V=F/2). Now V and T...
  3. Alexey881

    Simple Statics Problem?

    Thanks for a nice clear drawing :). I think I'm going to do F*h/w to get pullout and apply it to fastener 1 (its a bit more conservative ...say to deal with some tiny prying) The shear on fastener 1 will be F/2. For fastener 2 I will apply Pullout=F/2 and Shear=F*h/w (I will have some...
  4. Alexey881

    Simple Statics Problem?

    That if angles were (completely welded or completely rigedly attached to the stiff column frame, we could consider it part of the column and treat the entire system as one unit. And hence we'd be taking the distance between anchor holes now... + angle has to be super stiff
  5. Alexey881

    Simple Statics Problem?

    Thanks a lot for the replies, Right now i'm torn between three methods. 1) The one outlined in this forum 2) I've been told that we could take the whole column+angles attached as one system, then resolve the moment generated by force by dividing it by the distance between two concrete anchor...
  6. Alexey881

    Simple Statics Problem?

    Hey KootK, without the fasteners (bolts) between the column and the angle it is easy to assume that the entire force F goes through the left angle as in your picture. However, when you have a bolt, or a weld , wouldn't you have the shear V being transferred to both, left and right angles? Then...
  7. Alexey881

    Simple Statics Problem?

    Ok for starters. Lets assume that the column is just a square block of infinite stiffness (so no deformation) and the force acting is 1000 lb. The angles are connected to concrete. keep in mind I need to design 3 things. (The fastener to concrete, the fastener to the column, and the angle thickness)
  8. Alexey881

    Simple Statics Problem?

    Hey everyone. How structural engineers would treat this problem if they had to determine all forces on all fasteners of a column loaded in the following way on top? (ignore weight) h=w=10 in. a=b=1 in. I've consulted several engineers, and each had a different way of resolving a force and of...
  9. Alexey881

    LRFD (or LSD in canada) versus Allowable STRESS design.

    Thanks. So, just to confirm; Say I'm using LRFD or LSD and my factored load = phi(factored resistance). Does it mean that at this point my member is in the state of plastic deformation? Or it is in the elastic region? I find different answers, on some site someone said its in plastic, on other...
  10. Alexey881

    T section thickness prying calculation can be extended?

    You see, In my case I have a machine (box), on each length it has 2 angles bolted to it with one bolt each, and these angles are anchored to concrete. I need to design the angle size and the connections (bolt, and anchor). My machine is overturning over the boltholes on one of the lengths. So...
  11. Alexey881

    T section thickness prying calculation can be extended?

    Hey, yeah sorry, question b) was dumb. However, going back to a) I pulled up a paper on which this formula was based (http://www.cisc-icca.ca/files/publications/techpubs/design/bolting/highstrengthbolting.pdf (See Ch. 6)), and you're right this is derived based on both moments. But there is...
  12. Alexey881

    T section thickness prying calculation can be extended?

    Hello, 2 questions: a) I'm trying to find formulas that would permit to design angle thickness when the angle is loaded in tension and that may create prying. In the Canadian steel manual CSA-S16 (which is very similar to AISI) (in LSD or LRFD methods) There are formulas for a T-section loaded...
  13. Alexey881

    LRFD (or LSD in canada) versus Allowable STRESS design.

    Hello, I'm having a problem converting myself between methodologies. Let me explain: I'm a mechanical engineer who recently finished my studies, which were all in Allowable Stress Design (everything based on yield strength and safety factors). For different parts we would resolve force...
  14. Alexey881

    Bean Deflection Problem

    What if the distances are not unequal. For example between the wall and the rod (on both sides of the beam) the distance would be the same. The only variation is the distance between the rods. So, if I wanted to set up excel, would I have to start with the beam formula and then integrate and...
  15. Alexey881

    Bean Deflection Problem

    Here's the picture http://files.engineering.com/getfile.aspx?folder=86f1ac06-6233-4de7-aeef-62a37c480060&file=Beams.jpghttp://files.engineering.com/getfile.aspx?folder=86f1ac06-6233-4de7-aeef-62a37c480060&file=Beams.jpg
  16. Alexey881

    Bean Deflection Problem

    Hello, I am trying to find maximum bending moment developed in a fixed beam due to two equal (or unequal) equi-spaced forces. [This scenario happens when ventilation mechanics trying to suspend the duct with rods to the ceiling. However istead of attaching to the ceiling they put a channel or...
  17. Alexey881

    Determination of Center of rotation for indeterminate system

    Hey, flash. I understand what you're talking about but it seems to come down back to assumptions, as you noted yourself. The whole goal is to move away from assumptions and figure some sort of systematic way. Because of the variety of the possible available assumptions it is hard to pin point...
  18. Alexey881

    Determination of Center of rotation for indeterminate system

    Hello fellow engineers! I have a trouble determining axis of rotation for a few particular systems suspended on the wall, especially when multiple connections exist such that the system becomes statically in determinant. (See the file I attached). I've been looking in a few different books; Many...

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